ddalder gave me some guidance on disassembling the dashboard pieces. It is really a piece of cake. I was careful and took my time. I think it took all of a half an hour to remove the pieces he mentions (although I think you forgot the trim on the A pillars, they just pull off).
If I had a HUD to install, I'd do it for sure. The wiring should also be easy based on what ddalder says in a previous post. I recommend doing the research to really get your head around the big picture so you have a good idea of the task before you start. Knowing how the HUD fits and is wired-in before you begin, will make the whole job go quickly.
I have some photos of the dashboard of my '01 SE (no HUD) if you want to see what it may look like before you start.
2001 Bonneville SE - Dark Bronzemist Metallic - Mods: 180* thermostat, iPod adapter, Digital OnStar Upgrade
Planned Audio System upgrades: Front & Rear 7 Band Equalizer, Amps, Hands Free Bluetooth Cell Phone kit
Planned mods: Front PEM, Ported LIM, Ported Heads, ZZP SR Rockers, Aluminum Gaskets & Reprogram PCM